Device for detecting the insulation resistance of a high voltage battery system

Abstract

A device for detecting the insulation resistance of a high-voltage battery system of a motor vehicle that includes a high-voltage battery and a high-voltage component which is operatively connected to terminals of the high-voltage battery via converters. The device includes a reference resistor operatively connected to the terminals of the high-voltage battery via switches, with a voltage measurement device configured to detect the voltage present between each respective terminal and a reference potential of the vehicle; a voltage measurement device configured to measure the voltage between the terminals; and a coupling circuit configured to monitor the high-voltage component when the contactors are open.

What is claimed is:  
     
       1. A device for detecting insulation resistance of a high-voltage battery system of a motor vehicle that includes a high-voltage battery, the device comprising:
 a high-voltage component operatively connected to a first terminal and a second terminal of the high-voltage battery using contactors; 
 reference resistors operatively connected to the first terminal and the second terminal of the high-voltage battery via a respective first switch and a second switch, with a voltage measurement device configured to detect voltage values present between the first terminal and the second terminal and a reference potential of the vehicle; 
 a controller operatively connected to the first switch and the second switch and the voltage measurement device and configured to detect the voltage values present between the first terminal and the second terminal and the reference potential of the vehicle; and 
 a coupling circuit configured to monitor the high-voltage component when the contactors are open, the coupling circuit having a third switch and at least one coupling resistor connected directly to the first terminal of the high-voltage battery via the third switch, 
 wherein the insulation resistance of the high-voltage battery is measured by alternately switching the reference resistors to the first terminal and the second terminal, and the insulation resistance of the high-voltage component is measured by coupling the high-voltage component to the high-voltage battery. 
 
     
     
       2. The device of  claim 1 , wherein the controller is configured to detect the voltage values depending on switching states of the first switch and the second switch. 
     
     
       3. The device of  claim 2 , wherein the controller is operatively connected to the first switch and the second switch. 
     
     
       4. The device of  claim 3 , wherein the controller is configured to detect the voltage values depending on the switching states of the first switch and the second switch. 
     
     
       5. The device of  claim 1 , wherein the reference potential is a body of the motor vehicle. 
     
     
       6. A device for detecting insulation resistance of a battery system that includes a high-voltage battery, the device comprising:
 a high-voltage component operatively connected to a first terminal and a second terminal of the battery using switchable contactors; 
 reference resistors operatively connected to the first terminal and the second terminal of the battery via a respective first switch and a second switch, with a voltage measurement device configured to detect voltage values present between the first terminal and the second terminal and a reference potential; 
 a controller operatively connected to the first switch and the second switch and the voltage measurement device and configured to detect the voltage values present between the first terminal and the second terminal and the reference potential; and 
 a coupling circuit configured to monitor the component when the switchable contactors are open, the coupling circuit having a third switch and at least one coupling resistor connected directly to the first terminal of the high-voltage battery via the third switch, and 
 wherein the insulation resistance of the high-voltage battery is measured by alternately switching the reference resistors to the first terminal and the second terminal, and the insulation resistance of the high-voltage component is measured by coupling the high-voltage component to the high-voltage battery. 
 
     
     
       7. The device of  claim 6 , wherein the high-voltage battery is connected to the high-voltage component via switchable contactors. 
     
     
       8. The device of  claim 6 , wherein the battery system comprises a high-voltage battery system. 
     
     
       9. The device of  claim 8 , wherein the high-voltage battery system is for a motor vehicle. 
     
     
       10. The device of  claim 9 , wherein the reference potential is at a body of the motor vehicle. 
     
     
       11. The device of  claim 6 , wherein the controller is configured to detect the voltage values depending on a state of the first switch and a state of the second switch. 
     
     
       12. The device of  claim 11 , wherein the controller is operatively connected to the switchable contactors. 
     
     
       13. The device of  claim 12 , wherein the controller is configured to detect the voltage values depending on switching states of the switchable contactors. 
     
     
       14. A device for detecting insulation resistance of a high voltage battery system of a motor vehicle that includes a high-voltage battery, the device comprising:
 a high-voltage component operatively connected to a first terminal and a second terminal of the high-voltage battery via switchable contactors; 
 reference resistors operatively connected to the first terminal and the second terminal of the high-voltage battery, with a voltage measurement device configured to detect voltage values present between the first terminal and the second terminal and a reference potential of the motor vehicle; 
 a controller operatively connected to a first switch and a second switch and the voltage measurement device and configured to detect the voltage values present between the first terminal and the second terminal and the reference potential; and 
 a coupling circuit configured to monitor the component when the switchable contactors are open, the coupling circuit having a third switch and at least one coupling resistor connected directly to the first terminal of the high-voltage battery via the third switch, 
 wherein the insulation resistance of the high-voltage battery is measured by alternately switching the reference resistors to the first terminal and the second terminal, and the insulation resistance of the high-voltage component is measured by coupling the high-voltage component to the high-voltage battery. 
 
     
     
       15. The device of  claim 14 , wherein the high-voltage battery is connected to the high-voltage component via switchable contactors. 
     
     
       16. The device of  claim 14 , wherein the controller is operatively connected to the switchable contactors. 
     
     
       17. The device of  claim 16 , wherein the controller is configured to detect the voltage values depending on switching states of the switchable contactors.